Hello, I have a 1978 k5 blazer. It has a 350 with a serpentine belt conversion on it. Yesterday my belt got tore up and upon looking I noticed that the tensioner pulley was seized up, no big deal. Was taking apart the bracket that hold the tensioner pulley and AC compressor pulley and the edge of the cast iron bracket broke off right where it bolts into the motor. I need help on how to find this brakcet. Hopefully someone has a link or any information. I know how I describe this is vague and that's because I don't know the actual name of this cast iron bracket. Will attatch a picture. Thanks guys!!

 

The manufacturer of the conversion kit would be the place to start. Look for a "new" conversion kit to find manufacturers if you don't know...good luck